I had some new problem with other files...
It seems that files containing accent like à, é ... used in french cause problem... In fact, files that have problems were containing accent...
Sorry for my english, quite tired, even at this hour ;-)
[edit] maybe it is due to my system (fedora core ) that doesn't really support renaming files with accent : yes i can't rename files with accent, so maybe the problem is amule can't write the file with its real name??